Depends how far along your tomatoes are as to whether you need to be worried about losing your harvest. Every year around this time, the older leaves on my tomatoes turn yellow with brown spots, but it never seems to effect the plants in any significant way, so I have never bothered to id the problem. Check out Margaret’s tomato trouble faqs as well as Cornell’s tomato disease diagnostic tool to figure out what you have.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.